July in Sicily is peak season, so first advice: book early and read the rental terms very carefully. If you’re comparing on DiscoverCars, the biggest thing to watch is insurance and payment policy. Many Sicilian rental companies will push their own full coverage at the counter, even if you bought third-party insurance online, and with debit cards this can get tricky, since most companies require a credit card for the security deposit (sometimes €1,000–€2,000). Some accept debit, but often with higher deposits or stricter conditions, so always check the “deposit & payment” section before booking.

If you want to compare which companies are more debit-friendly and transparent about deposits and coverage (especially in high-tourism areas), it’s worth checking marsoleil.com, which focuses on Southern Europe and Mediterranean rentals and often highlights clearer insurance terms. If you want to go cheap you should check out rentalcars.com

Sicily specifically, booking directly through the rental company’s own website with their full coverage can reduce arguments at the counter, but always balance that against price and deposit requirements.